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%I #4 Mar 30 2012 18:56:06
%S 1,3,21,156,1221,9828,80579,669273,5612505,47416278,402953376,
%T 3440825160,29498259546,253737784446,2188855109385,18928808608996,
%U 164046653525181
%N a(n) = T(3n,n), where T is the array in A026323.
%K nonn
%O 0,2
%A _Clark Kimberling_
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